I have an 03 duramax that will not start. White smokes while cranking. Replaced all 8 injectors. New ECM. New F.I.C.M. New cam and crank position sensors.Also did a compression test which showed everything to be ok. At crank it shows the actual rail pressure is over 6,000 psi. I have an industrial injection stage 3 modified cp3 pump. Is 6,000 to much fuel at crank? Only thing I havent replaced is the FCA on the injection pump. If anyone has the answer i need i sure would appreciate it.